2010•BioEssaysOpen access

Non‐random autosome segregation: A stepping stone for the evolution of sex chromosome complexes?

Tanja Schwander, Leo W. Beukeboom

Abstract

A new study in Caenorhabditis elegans shows that homologous autosomes segregate non-randomly with the sex chromosome in the heterogametic sex. Segregation occurs according to size, small autosomes segregating with, and large autosomes segregating away from the X-chromosome. Such sex-biased transmission of autosomes could facilitate the spread of sexually antagonistic alleles whose effects favor the fitness of one sex at the expense of the other. This may provide a first step toward the evolution of new sex determination systems.

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Available abstract

Key concepts: Autosome, Heterogametic sex, Biology, Evolution of sexual reproduction, X chromosome, Genetics, Chromosome, Homologous chromosome